JP5155954B2 - Engine work machine ventilation system - Google Patents

Description

  The present invention relates to a ventilation device for an engine working machine including an engine, a working machine driven by the engine, and electrical components, and storing the engine, the working machine, and electrical components in a housing.

Patent Document 1 (Japanese Patent No. 3803578) is an example of an engine working machine ventilation device that includes an engine and an inverter for controlling a generator driven by the engine, and the engine and the inverter are housed in a casing. is there.
In Patent Document 1, in the engine working machine in which the engine and the working machine are accommodated, exhaust heat recovery efficiency is improved while easily avoiding the heat influence on the parts that are desired to avoid the heat influence.

  That is, in Patent Document 1, as shown in FIG. 4, the air introduced from the cooling air intake port 062 once rose from the ascending passage portion 063 a formed by the passage forming member 064 to the upper passage portion 063 b. After that, a part of the air is distributed to the descending passage portion 063c and most of the remaining portion is distributed to the narrow passage portion 063e, and descends to the vent hole 059 provided with the assist fan 060. Thus, the electronic control unit 014, the control power supply unit 015, and the inverter unit 016 are cooled.

Japanese Patent No. 3803578

  In Patent Document 1 (Japanese Patent No. 3803578), the air from the cooling air suction port 062 once rises from the ascending passage portion 063a to the upper passage portion 063b, and then a part thereof enters the descending passage portion 063c. Most of the remaining portion is distributed to the narrow passage portion 063e and descends to the vent hole 059 provided with the assist fan 060. By the air flowing through the intake passage, the electronic control unit 014, the control power supply unit 015, and the inverter Unit 016 and the like are cooled.

  However, in Patent Document 1, by using a guide duct as a cooling air passage, an air flow including dust and moisture introduced from outside the cabinet is not directly applied to an electronic component such as an inverter. No means for preventing rusting and dust accumulation of the electronic component by being applied only to the heat radiating plate portion of the electronic component is not shown.

  In view of the problems of the prior art, the present invention provides an engine working machine equipped with an engine, a working machine driven by the engine, and electrical components, by combining the flow of cooling air in the housing with two guide ducts. Then, the air flow is made to flow through the heat sink so as to cool only the heat sink of the electrical component, and then cooled upward, then discharged upward into the engine room, and the air flow including dust and moisture introduced from the outside of the housing is an inverter. It is an object of the present invention to provide a ventilation device for an engine working machine that prevents direct contact with an electronic component such as rust, prevents rusting of the electronic component and accumulation of dust, and enhances a cooling effect.

The present invention achieves such an object, and includes an engine, a working machine driven by the engine, and an electrical component having a heat sink, and ventilation of the engine working machine in which the engine, the working machine, and the electrical component are housed in a housing. In the device
An inlet passage extending upward from the ventilation air inlet of the housing, and air flowing upwardly through the inlet passage, which is provided in the upper portion of the inlet passage, is redirected downward and introduced into the electrical compartment. In addition, the first duct that regulates the air path in the outer peripheral direction of the electrical component installed in the electrical compartment, and the second duct is formed on the electrical compartment side by partitioning the electrical compartment and the engine room, and the first duct A partition plate for guiding the air having passed through the second duct below,
A heat sink connected to the electrical component and disposed on a surface different from the mounting substrate surface of the electrical component,
A communicating hole formed to face the lower position of the heat radiating plate, and a turning portion of the second duct diverting upwards the air introduced from the communication hole,
Comprising the upward air passage to flow into the engine room air having passed through the direction changing portion upward from below the radiator plate,
The heat sink is disposed so as to face the upward air passage or the second duct without facing the mounting board surface into the upward air passage or the second duct .

In such invention, it is preferable that the electrical component is characterized in that the mounting board surface digits set the heat radiating plate on the opposite side.

Further, in such invention, preferably, provided with a fan driven by the engine into the housing, the fan with the heat radiating plate cooled to whether al on by the air passing through the turning portion of the second duct The air is introduced into the engine room through a direction air passage, and discharged from the ventilation air outlet of the housing to the outside.

Therefore, according to the present invention, a partition plate that partitions the electrical compartment and the engine compartment to form the second duct on the electrical compartment side and guides the air that has passed through the first duct to the lower side of the second duct ;
A heat sink connected to the electrical component and disposed on a surface different from the mounting substrate surface of the electrical component,
Wherein a heat radiating plate communication holes formed to face the lower position of the turning portion of the second duct diverting upwards the air introduced from the communication hole, the air the heat radiating plate via the direction changing section comprising a from below and upward air passage to flow into the engine room upward, the mounting substrate surface without facing the upward air passage or the second duct, facing the heat radiating plate to the upward air passage arranged to, in order that is configured to cool the heat radiating plate of the by air flowing through the upper facing air communication path electrical equipment, flowed diverted downwardly by the first duct toward the first duct downward The flowing air is guided by the partition plate, flows downward along the partition plate, flows downward through the outer peripheral side of the electrical component, and is perforated to the lower part of the electrical component and led to the communication hole, and further below the electrical component. the air introduced to the site Serial also to cool the heat radiating plate of the electrical component by an upward air stream flowing from below upward by the second duct upstream air passage is diverted upwards by turning part of, from outside the housing to the ventilator outer box in Prevents rusting and dust accumulation of electronic parts because it prevents inhaled dust and humidity containing air from directly hitting mounted electronic parts such as electrical components and ECUs (engine control units) and connection terminals. The life of the electronic component can be extended.

Further, according to the present invention, the air is led to the second duct installed in the adjacent portion across the partition plate through the communication hole drilled in the lower position of the electrical component of the partition plate. In order to flow upward in the direction change part of the second duct and flow to the upward air passage, the flow velocity toward the upper side of the air flowing in the upward air passage increases, and the upward air passage is faced. The cooling property of the heat sink of the provided electrical equipment is improved.

Further, according to the present invention, the air that has passed through the direction changing portion of the second duct that changes the direction upward is discharged to the upper part of the engine room through the upward air passage after cooling the heat dissipation plate of the electrical component. The air layer in the high temperature part at the upper part of the engine room is agitated with the air discharged upward, and the temperature of the engine room becomes uniform.

  Further, according to the present invention, the electrical component that is provided in the upper part of the inlet passage, changes the direction of the air that flows upward through the inlet passage, is introduced into the electrical compartment, and is installed in the electrical compartment. A combination of a first duct that regulates the air path in the outer circumferential direction and a second duct that changes the direction of the air introduced into the communication hole formed in the lower position of the electrical component of the partition plate. The air is caused to flow from the upper side to the lower side in the housing by the first duct and the direction is changed by the lower second duct to cool the inverter heatsink, so that the orientation of the first duct and the second duct By selecting the size, it is possible to obtain an optimal air flow in the housing.

Moreover, Te present invention smell, before Symbol electrical component is provided with the heat sink surface different from the mounting substrate surface, and provided with a heat radiating plate so as to face the upward air passage or the second duct, for example, Air containing dust and humidity that is sucked into the housing from outside the housing by providing a heat sink for electrical components on the surface opposite to the mounting substrate surface so as to face the upward air passage or the second duct. However, it is possible to avoid direct contact with the electrical components and connection terminals on the mounting board surface side, and when cooling the electrical components, it will hit the heat sink connected to the opposite side surface of the electrical components to ensure the cooling effect it can.

  In the present invention, preferably, a fan driven by the engine is provided in the housing, and after the air is cooled by the fan and the heat sink is introduced into the engine room via the upward air passage. It is preferable that the air is exhausted from the ventilation air outlet of the housing. With such a configuration, air flows in from the air inlet by the suction force of the fan, cools the heat dissipation plate of the electrical component, and By passing the air that has passed through the engine room from below to the engine room, the inside of the engine room is agitated to cool the inside of the engine room, and the cooled air flows so as to be discharged from the ventilation air outlet. It can flow through the inside to ensure cooling and ventilation.

It is a schematic side view of the engine ventilation apparatus which accommodated the engine and inverter concerning the Example of this invention in the ventilation apparatus outer case. It is AA sectional drawing of FIG. It is a Z arrow line view in FIG. It is explanatory drawing of a prior art.

  Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.

  1 is a schematic side view of a ventilator for an engine working machine in which an engine and an inverter according to an embodiment of the present invention are housed in a ventilator outer box, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG.

1 to 3, an electrical compartment 30 is formed in the ventilator outer box (housing) 1, and the electrical compartment 30 is used for output control of a generator (not shown) driven by the engine. An inverter (electrical component) 8 is provided at the center, and an ECU (engine control device) 10 is installed in the upper part of the electrical component chamber 30.
An air inlet 2 is provided at the front part (back side as an engine working machine) of the electrical compartment 30, and an inlet partition plate 3 extending in the vertical direction so as to face the air inlet 2 is provided. A duct inlet 6 is opened at the top of 3, and an inlet passage 4 extending upward from the air inlet 2 to the duct inlet 6 is formed. Since it extends upward from the air inlet 2 to the duct inlet 6, the intrusion of rainwater can be prevented.

A first duct 7 is formed in the upper portion of the inlet passage 4 to change the direction of the air flowing upward in the inlet passage 4 (air flow is indicated by an arrow). The air flows in a downward direction in the first duct 7, and as shown in FIG. 2, a vertical electrical compartment partition plate (partition) that guides the air flowing downward from the first duct 7. Plate) 11 is provided. The electrical compartment partition plate 11 is provided in a direction parallel to the wall surface perpendicular to the wall surface of the ventilator outer box 1 in which the air inlet 2 is provided, and below the inverter 8 below the electrical compartment partition plate 11. A communication hole 5 is perforated in the portion, and air from the first duct 7 flows downward along the electrical compartment partition plate 11 and flows downward through the outer peripheral side of the inverter 8 to flow to the communication hole 5. Led up to. That is, the outflow direction from the first duct is regulated so as to be on the outer peripheral side of the inverter 8, and does not go directly to the inverter 8 but flows so as to bypass the inverter 8 and is led to the communication hole 5 in the lower part.
The communication hole 5 opens into a heat sink cooling chamber 13 defined in a lower portion of a heat sink (heat sink) 9 connected to the inverter 8.

  In the heat sink cooling chamber 13, air that has flowed downward by the first duct 7 so as to cover the heat sink cooling chamber 13 is introduced into a lower portion of a heat radiating plate (heat sink) 9 connected to the inverter 8. A second duct 15 is formed to change the direction upward.

An upward air passage 15 a that allows the air in the heat sink cooling chamber 13 to flow upward from below is formed by the second duct 15 so as to surround the heat radiating plate 9.
Therefore, the air in the heat sink cooling chamber 13 is provided with the heat radiating plate 9 connected to the inverter 8 facing the upward air passage 15a, and the heat radiating plate 9 is cooled by the air flowing through the upward air passage 15a. It will be configured as follows.

  Here, the inverter 8 is provided with the heat radiating plate 9 connected to the inverter 8 on the surface opposite to the mounting substrate surface 8a so as to face the upward air passage 15a. Cooling of the inverter 8 through the heat sink 9 is avoided while avoiding that air containing dust or humidity sucked inside directly hits the elements and connection terminals of the inverter 8 provided on the mounting substrate surface 8a side. It can be done reliably. The heat sink 9 of the inverter may not be provided so as to face the upward air passage 15 a but may face the second duct 15.

Further, in this embodiment, as described above, the vertical electrical compartment partition plate 11 for guiding the air flowing downward through the first duct 7 and the lower portion of the longitudinal electrical compartment partition plate 11 are perforated. In addition, a communication hole 5 that guides air along the electrical compartment partition plate 11 to the second duct 15 is provided.
Accordingly, the air flowing downward through the first duct 7 is guided by the vertical electrical compartment partition plate 11, and the electrical compartment is passed through the communication hole 5 drilled in the lower portion of the electrical compartment partition plate 11. Since the air is led to the second duct 15 installed in the adjacent portion across the partition plate 11, the air is concentrated in the communication hole 5, and then the direction is changed upward by the second duct 15 to flow to the upward air passage 15a. Therefore, the flow velocity toward the upper side of the air flowing through the upward air passage 15a is increased, and the cooling performance of the radiator plate 9 of the inverter 8 provided facing the upward air passage 15a is improved.

Air after cooling the heat radiating plate 9 passes through the upward air passage 15a and is discharged upward of the engine room 12 as indicated by the arrows in FIG.
In this way, the air that has passed through the second duct 15 whose direction is changed upward is discharged to the upper side of the engine room 12 through the upward air passage 15a after cooling the heat radiating plate 9 of the inverter 8. The temperature of the engine room 12 becomes uniform by stirring the air layer in the high temperature part with the air discharged upward.

Further, a cooling fan (fan) 35 that is driven by the engine and cools a working machine (generator, etc.) is installed in the engine room 12, and the air discharged and stirred toward the engine room 12 is supplied to the fan 35. Then, the work machine is cooled, sent to the ventilation box 41 through the ventilation hose 39, and after being silenced, is discharged from the ventilation air outlet 43 to the outside.
That is, air flows in from the air inlet 2 by the suction force of the fan 35, cools the heat sink 9 of the inverter 8, stirs the engine room 12, cools the engine room 12, and the cooled air becomes Since it flows so that it may be discharged | emitted from the air outlet 43 for ventilation, air flows so that the inside of the ventilator outer case 1 may be penetrated, and cooling and a ventilation action can be performed reliably.

  According to the above embodiment, the first duct 7 changes its direction downward and flows, and the air flowing downward from the first duct 7 is guided by the vertical electrical compartment partition plate 11 as shown in FIG. Then, the air from the first duct 7 flows downward along the electrical compartment partition plate 11 and flows downward through the outer peripheral side of the inverter 8 to be perforated in the lower part of the inverter 8 and led to the communication hole 5. Furthermore, the air introduced into the lower part of the inverter 8 is redirected upward by the second duct 15 and the heat sink 9 of the inverter 8 is provided for the upward air flow that flows upward from below through the air passage 15a. The air containing dust and humidity flowing from the outside of the ventilator outer box 1 can be prevented from directly hitting the mounted electronic components such as the inverter 8 and the ECU (engine control device) 10 and the connection terminals. Cal can prevent deposition of rust and dust of electronic components, it can prolong the life of electronic components.

  Further, according to this embodiment, the air flowing upward in the inlet passage 4 provided in the upper part of the inlet passage 4 extending upward from the ventilation air inlet 2 of the ventilator outer box 1 is redirected downward. The first duct 7 and the second duct that changes the direction of the air introduced into the communication hole 5 formed at a position below the inverter 8 of the electrical compartment partition plate 11 are provided in combination, thereby providing the first air. The duct 7 flows from the upper side to the lower side in the ventilator outer box 1 and is turned upward by the lower second duct to cool the heat sink of the inverter. Therefore, the direction of the first duct and the second duct By selecting the size, the optimum air flow in the ventilator outer box 1 can be obtained.

  According to the present invention, in an engine working machine having an engine and an inverter for controlling the output of a generator driven by the engine, the flow of cooling air in the enclosure is combined with two guide ducts to The flow of air is configured to cool only the heat sink of the inverter, and the air is exhausted upward to the engine room after cooling the heat sink, and air containing dust and moisture introduced from outside the housing It is possible to prevent the flow from directly hitting an electronic component such as an inverter, thereby preventing rusting and dust accumulation of the electronic component and enhancing the cooling effect, which is suitable for a ventilation device for an engine working machine.

1 Ventilator outer box (housing)
2 Air inlet 3 Inlet partition plate 4 Inlet passage 5 Communication hole 6 Duct inlet 7 First duct 8 Inverter (electrical equipment)
8a Mounting board surface 9 Heat sink (heat sink)
10 ECU (electronic control unit)
11 Electrical compartment partition plate (partition plate)
13 Heat Sink Cooling Room 15 Second Duct 15a Upward Air Passage 30 Electrical Room

Claims (3)

In an engine working machine ventilation device comprising an engine and an electrical component having a working machine driven by the engine and a heat sink, the engine, the working machine and the electrical component being housed in a housing,
An inlet passage extending upward from the ventilation air inlet of the housing, and air flowing upwardly through the inlet passage, which is provided in the upper portion of the inlet passage, is redirected downward and introduced into the electrical compartment. In addition, the first duct that regulates the air path in the outer peripheral direction of the electrical component installed in the electrical compartment, and the second duct is formed on the electrical compartment side by partitioning the electrical compartment and the engine room, and the first duct A partition plate for guiding the air having passed through the second duct below,
A heat sink connected to the electrical component and disposed on a surface different from the mounting substrate surface of the electrical component,
A communication hole formed facing the lower position of the heat radiating plate, and a direction changing portion of the second duct for changing the direction of air introduced from the communication hole upward,
Comprising the upward air passage to flow into the engine room air having passed through the direction changing portion upward from below the radiator plate,
A ventilation device for an engine working machine , wherein the heat sink is disposed facing the upward air passage or the second duct without facing the mounting board surface into the upward air passage or the second duct . The electrical component, the heat radiating plate ventilator engine working machine according to claim 1, wherein the setting digit to the surface opposite to the mounting substrate surface. It provided a fan driven by the engine into the housing by the fan, introduced into the second duct engine room through the upper facing air passage or found by cooling the heat radiating plate by the air passing through the turning part of the is, ventilator of claim 1, wherein the engine working machine, characterized by discharging the ventilation air outlet of the casing to the outside.

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